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The lonely one offers his hand too quickly to whomever he encounters.
Friedrich Nietszche

To be an adult is to be alone.
Jean Rostand

Loneliness and the feeling of being unwanted is the most terrible poverty.
Mother Teresa

One may have a blazing hearth in one's soul, and yet no one ever comes to sit by it.
Vincent Van Gogh

“Loneliness is the first thing which God's eye named, not good”

John Milton quotes

People who lead a lonely existence always have something on their minds that they are eager to talk about.
Anton Checkov

So lonely 'twas that God himself scarce seemed there to be.

- Samuel Taylor Coleridge